Resolved SSD C:\ 118 GB all of a sudden is "full" (@117GB)

I have no real storage files (image, audio or MP4) on that drive. this appears to have become an issue since the last windows update. I have done the windows disk cleanup, with no appreciable change. I even ran Debloater and still . . . .
is it worth it to get a newer (larger) SSD and mirror the old one

 

I think the space problem is caused by the old data being retained for 10 days in case you need to undo the update due to a problem.
The replaced data will be removed/deleted after 10 days.
1TB (1000GB) SSD's are not that expensive these days and this is what I use in my comps.
Depending on what your motherboard is capable of handling, over the last 4 or so years, NVMe2 SSD's are becoming quite common fitment.
I would definitely investigate what you can do to increase your storage as newer SSD's can improve the speed of your comp.
Macrium Reflect, EaseUS and AOMEI are 3 cloning system softwares that I have used when swapping to a larger storage drive.

 

am I able to dump any of these?
they (some) seem redundant

 

I wouldn't touch them as they only account for 365MB! Necessary part of the OS.

 

This may simply be Backup and Restore using up your space with backups. This is not harmful and it will not consume it all. It will purge old as it adds new.

But you can manually go in and free up some, if you like. See Manage Space for Windows Backup in Windows 10 | Tutorials (tenforums.com)